D17617.diff
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	Index: sys/net/if_vlan.c
	===================================================================
	--- sys/net/if_vlan.c
	+++ sys/net/if_vlan.c
	@@ -570,10 +570,17 @@

	VLAN_XLOCK_ASSERT();

	+ if (ifp->if_flags & IFF_DYING)
	+ return (ENXIO);
	+
	/* Find the parent. */
	sc = ifp->if_softc;
	ifp_p = PARENT(sc);

	+ /* check if parent is freed */
	+ if (ifp_p == NULL)
	+ return (ENXIO);
	+
	CURVNET_SET_QUIET(ifp_p->if_vnet);

	/* First, remove any existing filter entries. */